Pilot-scale demonstration of the hybrid zero-valent iron process for treating flue-gas-desulfurization wastewater: Part II

2013 ◽  
Vol 67 (2) ◽  
pp. 239-246 ◽  
Author(s):  
Yong H. Huang ◽  
Phani K. Peddi ◽  
Hui Zeng ◽  
Ci-Lai Tang ◽  
Xinjun Teng
Keyword(s):  
Heavy Metals ◽  
Flue Gas ◽  
High Performance ◽  
Treatment Process ◽  
Low Cost ◽  
Pilot Scale ◽  
Zero Valent Iron ◽  
Flue Gas Desulfurization ◽  
Waste Production ◽  
Water Problems

The hybrid zero-valent-iron (hZVI) process is a novel chemical treatment process that has shown promise for removing heavy metals and nutrients from industrial wastewaters. In this study, a pilot-scale demonstration was conducted to continuously treat 3.8–7.6 L/min (1–2 gpm) of the flue-gas-desulfurization (FGD) wastewater at a coal-fired power plant for 5 months. In this paper, a spike test was conducted to evaluate performance of the hZVI process for removing selected toxic metals at artificially elevated concentrations. The results showed that a multiple-stage hZVI process could decrease selenate-Se from 22 mg/L to ∼10 μg/L and dissolved Hg2+ from 1.15 mg/L to ∼10 ng/L. In addition, the process simultaneously removed a broad spectrum of heavy metals such as As(III), As(V), Cr(VI), Cd(II), Pb(II) and Cu(II) from mg/L to near or sub-ppb (μg/L) level after a single-stage treatment. The process consumed about 0.3 kg ZVI per 1 m3 FGD wastewater treated at a cost of about US$0.6/m3. Solid waste production and energy consumption were reasonably low. The successful pilot study demonstrated that the hZVI technology can be a low-cost, high-performance treatment platform for solving some of the toughest heavy metal water problems.

Pilot-scale demonstration of the hybrid zero-valent iron process for treating flue-gas-desulfurization wastewater: Part I

2013 ◽  
Vol 67 (1) ◽  
pp. 16-23 ◽  
Author(s):  
Yong H. Huang ◽  
Phani K. Peddi ◽  
Hui Zeng ◽  
Ci-Lai Tang ◽  
Xinjun Teng
Keyword(s):  
Flue Gas ◽  
High Performance ◽  
Treatment Process ◽  
Hydraulic Retention Time ◽  
Low Cost ◽  
Pilot Scale ◽  
Zero Valent Iron ◽  
Flue Gas Desulfurization ◽  
Stage System ◽  
Water Problems

The hybrid zero-valent-iron (hZVI) process is a novel chemical treatment process that has shown great potential in previous laboratory and field bench-top scale tests for removing selenium, mercury and nutrients from various industrial wastewaters. In this study, a pilot-scale demonstration was conducted to continuously treat 3.8–7.6 L/min (1–2 gpm) of the flue-gas-desulfurization (FGD) wastewater at a coal-fired power plant for five months. Results show that the hZVI process could simultaneously reduce selenate-Se from 1 to 3 mg/L to below 10 μg/L and mercury from over 100 μg/L to below 10 ng/L in compliance with the new stringent effluent discharge limits planned by the U.S. EPA for Se and Hg. A three-stage hZVI system with a combined hydraulic retention time of 12 h is sufficient for Se treatment, while a single-stage system can meet Hg treatment requirement. The successful pilot study demonstrated that the hZVI process is scalable and could be a reliable, low-cost, high-performance treatment platform with many application potentials, particularly, for solving some of the toughest heavy metal water problems.

Kinetic model for calcium sulfate α-hemihydrate produced hydrothermally from gypsum formed by flue gas desulfurization

2015 ◽  
Vol 48 (3) ◽  
pp. 827-835 ◽  
Author(s):  
Mingliang Tang ◽  
Xuerun Li ◽  
Yusheng Shen ◽  
Xiaodong Shen
Keyword(s):  
Flue Gas ◽  
Calcium Sulfate ◽  
High Performance ◽  
Transformation Process ◽  
Flue Gas Desulfurization ◽  
Synthesis Process ◽  
Stable Phase ◽  
Hydrothermal Conditions ◽  
Simple Method ◽  
Kinetics Of

Modeling of the kinetics of the synthesis process for calcium sulfate α-hemihydrate from gypsum formed by flue gas desulfurization (FGD) is important to produce high-performance products with minimal costs and production cycles under hydrothermal conditions. In this study, a model was established by horizontally translating the obtained crystal size distribution (CSD) to the CSD of the stable phase during the transformation process. A simple method was used to obtain the nucleation and growth rates. A nonlinear optimization algorithm method was employed to determine the kinetic parameters. The model can be successfully used to analyze the transformation kinetics of FGD gypsum to α-hemihydrate in an isothermal batch crystallizer. The results showed that the transformation temperature and stirring speed exhibit a significant influence on the crystal growth and nucleation rates of α-hemihydrate, thus altering the transformation time and CSD of the final products. The characteristics obtained by the proposed model can potentially be used in the production of α-hemihydrate.

Treatment of Wastewater from Flue Gas Cleaning

1994 ◽  
Vol 29 (9) ◽  
pp. 307-312 ◽  
Author(s):  
Michael Vendrup ◽  
Christina Sund
Keyword(s):  
Heavy Metals ◽  
Flue Gas ◽  
Chemical Precipitation ◽  
Pilot Scale ◽  
Full Scale ◽  
Basic Operation ◽  
Gas Treatment ◽  
Gas Cleaning ◽  
Operation Rules ◽  
The Usa

Wet scrubber systems for flue gas treatment, giving rise to a production of wastewater contaminated with heavy metals, are used at many coal-fired power stations in Europe, the USA and Japan. In order to remove the heavy metals from the wastewater, chemical precipitation with hydroxide and sulphide is applied. Results from two full-scale plants are given. Due to strict regulations for landfilling of waste contaminated with heavy metals, the amount of sludge must be minimised. Different techniques to meet this requirement are described. Biological post-treatment to reduce the nitrogen content of the wastewater will apparently be a need in the future, and pilot-scale testing is presently being carried out to determine the basic operation rules for a full-scale plant.

Variations in heavy metals and turbidity in wastewater from wet flue gas desulfurization by electrocoagulation

2019 ◽  
Vol 141 ◽  
pp. 82-88
Author(s):  
C. Zhou ◽  
◽  
H.Y. Zhang ◽  
J.W. Chen ◽  
X.L. Liu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Flue Gas ◽  
Flue Gas Desulfurization

Advanced Coal-Fired Power Plants

2000 ◽  
Vol 123 (1) ◽  
pp. 4-9 ◽  
Author(s):  
Lawrence A. Ruth
Keyword(s):  
Power Systems ◽  
Flue Gas ◽  
High Performance ◽  
Power Plants ◽  
Pilot Scale ◽  
Combined Cycle ◽  
Department Of Energy ◽  
Electric Power Plants ◽  
Air Temperatures ◽  
Low Emission

The U.S. Department of Energy is partnering with industry to develop advanced coal-fired electric power plants that are substantially cleaner, more efficient, and less costly than current plants. Low-emission boiler systems (LEBS) and high-performance power systems (HIPPS) are based, respectively, on the direct firing of pulverized coal and the indirectly fired combined cycle. LEBS uses a low-NOx slagging combustion system that has been shown in pilot-scale tests to emit less than 86 g/GJ (0.2 lb/106 Btu) of NOx. Additional NOx removal is provided by a moving bed copper oxide flue gas cleanup system, which also removes 97–99 percent of sulfur oxides. Stack levels of NOx can be reduced to below 9 g/GJ (0.02 lb/106 Btu). Construction of an 80 MWe LEBS proof-of-concept plant is scheduled to begin in the spring of 1999. Engineering development of two different HIPPS configurations is continuing. Recent tests of a radiant air heater, a key component of HIPPS, have indicated the soundness of the design for air temperatures to 1150°C. LEBS and HIPPS applications include both new power plants and repowering/upgrading existing plants.

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